Feeding control method and system of band sawing machine

Abstract

The invention discloses a feeding control method and system of a band sawing machine, and the method comprises the steps of system preparation and verification, forward feeding, reverse fine adjustment before sawing, emergency protection and safe reset, and material conveying and accurate positioning are achieved by controlling forward and reverse rotation of a driving motor. Safety is guaranteed based on a double triggering and resetting mechanism of the scram button and the motor protector; the system comprises a feeding module and a control module, a rack of the feeding module is provided with a pre-guide plate in butt joint with a feeding port of the band sawing machine, the control module comprises a special control distribution box, a box body of the special control distribution box is of a stainless steel sealing structure, and an internal circuit integrates a safety enabling loop formed by connecting an emergency stop switch and a normally-closed contact of a motor protector in series. And the instruction level state indication loop is formed by connecting an alternating current contactor interlock and an indicating lamp in parallel. According to the feeding device, automation, precision and high safety of feeding of the band sawing machine are achieved.

Description

Technical Field

[0001] This invention relates to the field of band saw automation technology, specifically to a feeding control method and system for a band saw. Background Technology

[0002] Band saws are key pieces of equipment in metal processing for cutting various profiles. In traditional operation, material feeding to the band saw mainly relies on overhead cranes or manual handling, followed by manual positioning. This method has significant drawbacks: First, manual feeding is inefficient, labor-intensive, and difficult to match the band saw's cutting rhythm, becoming a bottleneck to production efficiency; second, manual positioning has poor accuracy, easily leading to inaccurate workpiece dimensions and material waste; third, when fine-tuning the centering of long strips of material is required, operation is extremely inconvenient and poses safety hazards.

[0003] Some companies have attempted to use fixed conveyor systems, but these systems are often single-function, only capable of unidirectional feeding. When the material is slightly misaligned or needs to be temporarily withdrawn, the system cannot provide reverse adjustment, still requiring manual intervention, resulting in a low level of automation. Furthermore, existing feeding systems generally lack comprehensive safety designs tailored to the band saw's working environment, have inadequate emergency shutdown mechanisms, or lack effective protection against motor overload, phase loss, or other malfunctions, posing risks of equipment damage and personal safety.

[0004] Therefore, there is an urgent need in this field for a feeding control method and system that can achieve automated bidirectional precise feeding, has highly reliable safety interlocking logic, and can be flexibly adapted to different models of band saws. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art by proposing a feeding control method and system for band saws. By introducing an automated feeding scheme with forward and reverse rotation control, emergency stop protection and fault self-checking functions, the invention solves the problems of low efficiency, poor accuracy, insufficient flexibility and poor safety of traditional feeding methods.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for controlling the feeding of a band saw, comprising the following steps: System preparation and verification steps: Before starting the system, perform the power-on operation and manually verify the smoothness of the transmission of the conveyor belt mechanism and the alignment of the pre-guide plate on the frame with the feed port of the band saw. Forward feeding step: Control the drive motor to drive the conveyor belt in the first rotation direction to transport the material toward the sawing inlet of the band saw; Pre-sawing reverse fine-tuning step: When the material is conveyed to the clamping vise area of ​​the band saw and has not yet been sawed, in response to the position correction command, the drive motor is controlled to run in a second rotation direction opposite to the first rotation direction, so that the conveyor belt moves in the reverse direction and the material is backed back a preset distance for repositioning. Emergency protection steps: In response to an emergency stop command or an overload / phase loss signal detected by the motor protector, the power supply to the main circuit and control circuit of the drive motor is simultaneously cut off. Safety Reset Procedure: After the emergency protection procedure is triggered, the system enters a safety lock state. The release of the safety lock state depends on the operator performing a rotary reset operation on the emergency stop button and a press reset operation on the motor protector.

[0007] Preferably, during the switching process between the forward feeding step and the pre-saw reverse fine-tuning step, an electrical interlocking logic formed by the auxiliary normally closed contacts of the first AC contactor and the second AC contactor ensures that the two do not engage simultaneously.

[0008] Preferably, the method further includes a command-level status indication step: generating a visual indication signal synchronized with the target rotation direction control command of the drive motor; wherein the visual indication signal used to indicate forward and reverse rotation is directly driven by the auxiliary contacts of the AC contactor controlling forward and reverse rotation, respectively, thereby isolating the issuance status of the control command from the actual on / off status of the main circuit.

[0009] In a second aspect, the present invention provides a band saw feeding control system for implementing the above method, comprising: The feeding module includes a frame, a conveyor belt mechanism mounted on the frame, and a drive motor connected to the drive roller of the conveyor belt mechanism via a transmission component; The control module includes a forward and reverse control distribution box, which is electrically connected to the drive motor via a cable; The frame has a pre-guide plate fixedly installed at one end near the feed inlet of the band saw. The pre-guide plate is configured to form a guide channel that seamlessly connects with the feed inlet of the band saw. The frame is configured to be movable or adjustable as a whole so that the pre-guide plate can be adapted to and aligned with feed inlets of different sizes of band saws. The forward and reverse rotation control distribution box includes: The enclosure is made of stainless steel and has a sealed structure to prevent the intrusion of liquids and dust; Electrical mounting plate, made of insulating material and fixed inside the enclosure; The door is electrically connected to the enclosure via a braided soft copper wire. The electrical mounting plate is equipped with a control circuit, which includes an emergency stop switch and a motor protector, and the normally closed contacts of the two are connected in series in the main control circuit of the system.

[0010] Preferably, the control circuit further includes: a leakage current circuit breaker, a first AC contactor and a second AC contactor, a forward rotation status indicator and a reverse rotation status indicator; the forward rotation status indicator is connected in parallel across the coil of the first AC contactor; the reverse rotation status indicator is connected in parallel across the coil of the second AC contactor.

[0011] Preferably, the electrical mounting plate has a thickness of at least 5 mm to provide structural support and ensure electrical insulation strength.

[0012] Preferably, the forward and reverse control distribution box has grounding screws welded to the lower sides of both sides of the box body, and the cable inlet and outlet holes on the box body are equipped with sealing gaskets.

[0013] Preferably, the transmission component is a chain and sprocket drive or a belt and pulley drive.

[0014] Preferably, the transmission component is a chain and sprocket transmission pair; the output shaft center of the drive motor and the axis of the drive roller have a set height difference in space, and the plane of the transmission chain between them forms an inclination angle with the horizontal plane; the transmission sprocket pair also includes a tensioning mechanism, which is arranged on the inclined upper side of the plane of the transmission chain.

[0015] Preferably, the axes of both the driving roller and the driven roller of the conveyor belt mechanism are supported on the frame by self-aligning bearings.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Improved automation and efficiency: It realizes automatic forward conveying and precise positioning of materials, and flexibly responds to various working conditions through the "pre-saw reverse fine adjustment" function, which significantly reduces manual intervention and improves the overall operating efficiency of the band saw.

[0017] 2. Enhanced operational safety and reliability: A dual safety triggering and reset mechanism consisting of an "emergency stop button" and a "motor protector" has been constructed, along with electrical interlocking of the AC contactor, forming multiple safety protections that effectively ensure the safety of equipment and operators.

[0018] 3. Achieved accurate fault diagnosis: Through a unique command-level status indication design (indicator lights and contactor coils connected in parallel), operators can intuitively distinguish between different states such as "control command issued" and "main circuit not executed", which greatly facilitates system maintenance and fault diagnosis.

[0019] 4. Excellent versatility and environmental adaptability: The feeding device, with its adjustable frame and pre-guide plate design, can be flexibly adapted to various band saws; the control box adopts a stainless steel enclosure, high protection level and specific internal structure, which can stably cope with the harsh environment of metal processing workshops.

[0020] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall system layout of a feeding control method and system for a band saw according to the present invention; Figure 2 This is a schematic diagram of the motor forward and reverse rotation control principle of a feeding control method and system for a band saw according to the present invention; Figure 3 This is a wiring diagram of the control box for a feeding control method and system for a band saw according to the present invention. Figure 4 This is an internal layout diagram of the control box of a feeding control method and system for a band saw according to the present invention. Detailed Implementation

[0022] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The band saw feeding control system of the present invention mainly includes a feeding module 100 and a control module 200.

[0023] The feeding module 100 includes a frame 101, a conveyor belt mechanism 102, and a three-phase asynchronous motor 103. The frame 101 is welded from structural steel to form a rectangular frame, with anchor bolts at its bottom to allow for movement, leveling, and alignment according to the position of the band saw on site. A pre-guide plate is fixedly installed at one end of the frame 101 near the band saw's feed inlet. This pre-guide plate is made of bent steel plate with a flared cross-section; its inlet width is greater than its outlet width, and its bottom plate curves upward to form a guiding slope. Its function is to ensure that the material conveyed from the conveyor belt 102 is accurately guided and centered to the band saw's feed inlet. The three-phase asynchronous motor 103 is connected to the drive roller of the conveyor belt mechanism 102 via a transmission assembly 104 (preferably a chain and sprocket drive pair in this embodiment, but a belt and pulley drive pair can also be used), providing power to it.

[0024] In a preferred embodiment of the present invention, the transmission assembly 104 employs a chain and sprocket transmission pair. The output shaft center of the drive motor 103 and the axis of the drive roller have a predetermined height difference in space, causing the plane of the transmission chain between them to form an angle with the horizontal plane. This inclined layout, combined with a tensioning mechanism arranged on the inclined plane of the transmission chain, effectively avoids tooth skipping and slack during transmission by utilizing the chain's own weight and supplementing with tension adjustment, ensuring the smoothness and reliability of power transmission.

[0025] Furthermore, the axes of both the driving roller and the driven roller of the conveyor belt mechanism 102 are supported on the frame 101 by self-aligning bearings. This self-aligning bearing structure can automatically compensate for the concentricity error that may exist between the frame 101 and the roller during installation, effectively preventing the conveyor belt from running off-center, thereby ensuring the straight-line accuracy of material conveying.

[0026] The core of the control module 200 is a forward and reverse control distribution box 201. The distribution box 201 is connected to the three-phase asynchronous motor 103 via cable 202 and is used to control its start-stop, forward and reverse rotation and provide safety protection.

[0027] The forward / reverse control distribution box 201 is constructed entirely of 304 stainless steel, including hinges and bolts. The box body and outer door panel are 1.2mm thick, with overall dimensions of 220mm (length) × 320mm (width) × 150mm (height). The exterior of the box is painted with off-white paint, conforming to the RAL color standard RAL7035. The box has a double-door structure, with the outer door equipped with a flat mechanical lock. It lacks a rainproof roof, and the rear section is an integral, non-removable structure. The protection rating is IP45, effectively preventing the intrusion of coolant and metal dust.

[0028] The front of the control box features, from top to bottom, a power indicator light HL1, a forward indicator light HL2, a reverse indicator light HL3, a forward button SB1, a stop button SB2, a reverse button SB3, and an emergency stop button SB4. A "Caution: Electric Shock" warning sign is also printed in the center of the outer door. The "Forward Indicator," "Reverse Indicator," and "Power Indicator" markings on the control box panel correspond to terminals X1, X2, and X3 respectively in the electrical schematic diagram.

[0029] The door and the body of the cabinet are connected by a cross section of not less than 10mm. 2 The braided soft copper wire ensures reliable electrical bonding. A 5mm thick epoxy resin board is fixed inside the enclosure as an electrical mounting plate, on which all electrical components are mounted, ensuring the insulation strength and mechanical stability of the mounting surface. Stainless steel grounding screws are welded to the lower sides of the enclosure, and all cable entry and exit holes are equipped with sealing rubber gaskets.

[0030] The factory nameplate is located in the upper right corner of the outer door.

[0031] The control circuit of this system includes: Residual current circuit breaker QF: serves as the main power switch; Emergency stop button SB4: Its normally closed contact is directly connected in series with the output of QF, forming the highest priority power-off path; Motor protector JD: Its main circuit is connected in series in the motor power supply circuit. The model of motor protector JD is JD-8. Its rated current adjustment range is 0.5-5A. It is used to realize the overload, phase loss and stall protection of the motor. Its normally closed contact for control is connected in series in the control circuit of the system. The key safety logic is as follows: The normally closed contact of the emergency stop button SB4 and the normally closed contact of the motor protector JD are connected in series to form a "safety enable circuit." The on / off state of this circuit directly determines whether the entire control circuit can be energized. If either one trips and disconnects the circuit, the system stops. After troubleshooting, SB4 must be rotated open to reset, and JD must be pressed to reset, before the system can return to standby mode.

[0032] The first AC contactor KM1 and the second AC contactor KM2: The two are electrically interlocked through auxiliary normally closed contacts, which respectively control the forward and reverse rotation of the motor to prevent phase-to-phase short circuits. Command-level status indication circuit: Forward rotation status indicator HL2 is directly connected in parallel across the coil of the first AC contactor KM1; reverse rotation status indicator HL3 is directly connected in parallel across the coil of the second AC contactor KM2. This design allows the indicator lights to directly reflect whether a "forward / reverse rotation command" has been issued, regardless of whether the main circuit is actually energized, providing a basis for rapid fault diagnosis.

[0033] The workflow of this invention is as follows: 1. Preparation and Verification: Close the residual current circuit breaker QF, and the power indicator light HL1 will illuminate. The operator manually rotates the drive roller to confirm that the conveyor belt is not jammed; adjust the position of frame 101 so that the pre-guide plate is precisely aligned with the feed inlet of the band saw.

[0034] 2. Forward Feeding: Press the forward rotation button SB1, KM1 engages, its main contacts close, the motor rotates forward, driving the conveyor belt 102 to feed material to the band saw. Simultaneously, HL2 lights up, indicating that the forward rotation command has been issued. The material is guided into the band saw processing area by the pre-guide plate.

[0035] 3. Reverse Fine-tuning: If the material position needs adjustment, press the reverse button SB3. At this time, KM2 engages (KM1 disengages due to interlock), the motor reverses, and the conveyor belt retracts the material. HL3 lights up. After the position is corrected, press SB1 again to continue forward feeding.

[0036] 4. Emergency Protection: In any emergency, pressing the emergency stop button SB4, or when the motor protector JD detects a fault, will disconnect the safety enable circuit, de-energize the control circuit, release all contactors, and immediately stop the motor.

[0037] 5. Safety Reset: After handling an emergency, the emergency stop button SB4 must be turned clockwise first, and then the reset button of the motor protector JD must be pressed. Both steps are necessary for the system to release the safety lock and return to normal operation.

[0038] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A band saw machine feeding control method, characterized by, The method comprises the following steps: System preparation and verification step: before starting the system, perform power-on operation, and verify the smoothness of the transmission belt mechanism (102) and the alignment state of the pre-guide plate on the rack (101) and the band saw machine feed port by manual method; Forward feeding step: control the driving motor (103) to drive the transmission belt (102) in the first rotation direction to transport the material towards the sawing feed port of the band saw machine; Reverse fine adjustment step before sawing: when the material is transported to the clamping vice area of the band saw machine and has not been sawed, in response to the position correction instruction, control the driving motor (103) to operate in the second rotation direction opposite to the first rotation direction to make the transmission belt (102) move reversely to retreat the material by a preset distance for repositioning; Emergency protection step: in response to the emergency stop instruction or overload / underload signal detected by the motor protector (JD), cut off the power supply of the main circuit and control circuit of the driving motor (103); Safety reset step: after the emergency protection step is triggered, the system enters a safety locking state; the release of the safety locking state depends on the joint completion of the screw reset operation of the emergency stop button (SB4) and the press reset operation of the motor protector (JD).

2. The method of claim 1, wherein, During the switching process of the forward feeding step and the reverse fine adjustment step before sawing, the electrical interlocking logic formed by the auxiliary normally closed contact of the first AC contactor (KM1) and the auxiliary normally closed contact of the second AC contactor (KM2) ensures that they are not attracted at the same time.

3. The method of claim 1, wherein, The method further comprises an instruction level state indication step: Generate a visual indication signal synchronized with the target rotation direction control instruction of the driving motor (103); wherein the visual indication signal for indicating forward rotation and reverse rotation is directly driven by the auxiliary contact of the forward rotation and reverse rotation AC contactors (KM1, KM2), so as to isolate and display the state of the control instruction and the actual on-off state of the main circuit.

4. A band saw machine feed control system characterized by, It comprises: A feeding module (100) comprising a rack (101), a transmission belt mechanism (102) mounted on the rack (101), and a driving motor (103) connected to the driving roller of the transmission belt mechanism (102) through a transmission assembly (104); A control module (200) comprising a forward and reverse rotation control distribution box (201) electrically connected to the driving motor (103) through a cable (202); The rack (101) is fixedly provided with a pre-guide plate at one end close to the feed port of the band saw machine, and the pre-guide plate is configured as a guide channel seamlessly connected with the feed port of the band saw machine; and the rack (101) is configured to be integrally movable or adjustable, so that the pre-guide plate can be adapted and aligned with the feed port of the band saw machine of different specifications; The forward and reverse rotation control distribution box (201) comprises: A box body made of stainless steel and having a sealed structure to prevent liquid and dust from entering; An electrical mounting plate made of insulating material and fixed inside the box body; A box door electrically connected to the box body through a braided soft copper wire; The electrical installation plate is provided with a control circuit, which includes an emergency stop switch and a motor protector, and the normally closed contacts of the two are connected in series in the total control circuit of the system.

5. The system of claim 4, wherein, The control circuit further includes: A leakage circuit breaker (QF) as a total power switch; A first AC contactor (KM1) and a second AC contactor (KM2) which are electrically interlocked through auxiliary normally closed contacts and control the forward rotation and reverse rotation of the driving motor (103) respectively; A forward rotation state indicator (HL2) and a reverse rotation state indicator (HL3); The forward rotation state indicator (HL2) is connected in parallel across the coil of the first AC contactor (KM1), and the reverse rotation state indicator (HL3) is connected in parallel across the coil of the second AC contactor (KM2).

6. The system of claim 4, wherein, The thickness of the electrical installation plate is at least 5 mm to provide structural support and ensure electrical insulation strength.

7. The system of claim 4, wherein, Grounding screws are welded to the lower sides of the box body of the forward and reverse rotation control distribution box (201), and sealing washers are provided for the cable inlet and outlet holes on the box body.

8. The system of claim 4, wherein, The transmission assembly (104) is a chain and sprocket transmission pair or a belt and pulley transmission pair.

9. The system of claim 4, wherein, The transmission assembly (104) is a chain and sprocket transmission pair; the center of the output shaft of the driving motor (103) and the axis of the driving roller have a set height difference in space, and the plane of the transmission chain and the horizontal plane form an inclination angle; the transmission chain and sprocket pair further includes a tensioning mechanism, which is arranged on the inclined upper side of the plane of the transmission chain.

10. The system of claim 4, wherein, The axes of the driving roller and the driven roller of the conveyor belt mechanism (102) are supported on the rack (101) through a self-aligning bearing.

Images